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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f9d7a0e30ebbcc028455f518d80f9e025a38e6584246c04f17e11313cbf956' 
  AND token = 'PLgUwVmHa8yY708BZ73M7QXSC8BlVx0kqa5bW8rMXzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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