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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bcc530f77a0be3210258d2222b85715c5d0bcd85b5672fdf9dc52e5073dddf' 
  AND token = 'o71z3/lnLzDIbEmDWeLK9iF2J5JyJ0URtLZx1Wuu+Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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