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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d605d0a07a7d28b046d28a27004d2f4a2d369ab6af78d65ea469d2d09148a4' 
  AND token = '9kmN1qjPAOmsOKzxD32XixVo+kzYDVQuhqhIHPoAVGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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