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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae4303b9b598025ee7155a927dbb328841ae273be918962eafb940b44d90e4b' 
  AND token = 'eGFj90yeth2HuIySZbOCNLB6a93tnu8kAJH+3G3BXo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}