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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030cc09d4a78872bb2c12c83b54253cc3da2c35cb10c9fd460d84a3ca20d6a8a' 
  AND token = 'T2sP7vk8auoYmPjnxcCWU/WmrKgQbfWzw5+rAX15UVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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