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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a3749af5b7fbe914e6421ee24ceaf4cb65deef3775002402f90c3abf527843' 
  AND token = 'HmrwnHt85n2Vrhu+A8U0NOYvJ2pwlHmveYrEZ0ii/YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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