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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba06531a9bb922e0a05f1d5f003d02bab217e809624d16e11bc518408d399ab' 
  AND token = '1eHEAuST6Oycuj8Bo5FGFmRPoHSIy58sWUVibT3dgus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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