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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd3400b68b46a3862caf5c0ca6ba4424cda74d57e0afa392cb890dedc1b87bc' 
  AND token = '6w/P/Yz0//3izx2tne34ZdjNxCN/6QURAxA8o4CQOT4=' 
  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"
    }
  }
}