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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259853a937c22a13ba28e2d8a414c41d08f43566aa631a33b156de9f3a8aa851' 
  AND token = 'DbKg0lSqa16jUy5LjKqR1rhCbBhgj1Q6Spew5U+srFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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