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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc50bc856f100806456baa808a1953b62fce0d3d88e02787f9e1b317c8b1db1e' 
  AND token = 'EfKcYUNde09wt8shBV7IycA7+At7lbR8GBfaJRQ/j38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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