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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b28156b852fcd3942085b40ab603c2c55f03b1adcf463e9a0257658977814e3' 
  AND token = 'QIFd77p5r7ZJ+vm+i3D1nOoDlc+DB9e3iQnQ9jNe9Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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