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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c8f1d42f47fb2441ca821a1f708ea9c1ee10214052b8d4a93760ffc544cee4' 
  AND token = '2wm9vm1GKcDPLtljr1J1XBDmWdwv+dxOOQSfhOqXvRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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