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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66b3c6b5c68df45e4fd53cd1bd5ece6de514fa6bb3eefb1d4713e80091b8bb8' 
  AND token = 'UQcU7B6BtSgtbefGXQmdY/ess/hgwTWeqR5x1SAwK0Q=' 
  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"
    }
  }
}