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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e32df7cee673b5a0b604a35570a56b573cf24e70b0605cab5a5e5be726423f' 
  AND token = 'O+HJejEwlGvqJrFpBjpXOWDQ3wJIl3nqw1uG4NIOlO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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