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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519c8167958e04a874092a439727c2fb4f9189f14dd69850263632e8a78d8ea8' 
  AND token = 'Bs7HxEcwGunMNw+3BTPNrNvC2cAt7MKbrIsZW6BsI1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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