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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb8325a1811f8fb21babf0debca6e4faf6267ebe0bd71df638fd1c3006b1462' 
  AND token = '+14FqPX7lXsEW/p6P8QlxaRBuiWB4ZQ47H+feoq/teE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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