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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194aed0512b91180502988d47414410ad1111f3bad15735fa218e504d3b09489' 
  AND token = '+6JOBYSP8o9Ub1AptqP2msLGPcg7hVBU60r9/XSWmZo=' 
  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"
    }
  }
}