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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add0a29c462b11e659b2316f4a055e6cb1e511b64ce43410b7602dbffd9e9b27' 
  AND token = 'Qp6dNEaTRy9AYftN6IibAsmzXatnD7zno60Br1AZZS4=' 
  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"
    }
  }
}