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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21449e3b19bc9b979cb8b2778d51d11e4244935f173f114c08cfe3c6b5d43d93' 
  AND token = 'FtU8w7krWPhfHibalpkFG8hkZx9TN7AK/OFxpG/0DlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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