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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6887ad3b97c910367a4223d67e3e56366b9381ba3eba41e0609a79fb35e8b1ea' 
  AND token = 'b2CcMIGH4wUkqCdN9KWxVWPSYw3Lx4VVRKAjuV3hOok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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