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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a52fa9c38422f82307d3e7166f732dfef78d32ca1c6d4bcd16027bb2d43837' 
  AND token = 'J130SGD5V3eiqYIa64iJ5Z+zRBIx9NWEXhiqt1eZfCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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