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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222fb93fb34d68074215f55a1986ded6f3323908ab0b7fea54ac7e3b18086398' 
  AND token = 'VcwGYjYEz3sDAWa2WYo9Xk9Gpc6IxGLkYmwhe5TvaE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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