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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0dec54819dc9df39fa9e7da1926880750f5b175cdf0282f105b6330c8cedfa' 
  AND token = 'v5VO696IOaEGtGfjJ5ohOnt9u5rVlKi6IGpcixbpWUw=' 
  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"
    }
  }
}