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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52646863627f13beb9c2e3d94e12be98057b13ae2285d1e648f89325d8034b17' 
  AND token = '9yoP5DvSoyrVtcuk6N6wZaN642LlQ+cHvgpvq3XGhgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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