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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51099b143f073612b2897ca284ecd280c25659095370b214adc4dc54f5202d93' 
  AND token = 'x9Umw2O55Ij/Or6sdUwBQ6wDVyU9vZ2UlOAb418dh1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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