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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd56828bb3ada2d8035f78d331b407b4ea1961c20a18c9c52d0f5a4b2db8d6da' 
  AND token = 'Cnsn9zUBd7rVANfoPaMaQa5vEFjvGAhHesO95/Pem4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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