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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59e36cc791f3b1e8121323bc2fb3c93b950615be8c5a5667dda5333df983109' 
  AND token = 'BS+ElbU3vrqJ534EsSU9wtK/drN4YJp+KU46s9aja8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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