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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7c21a167b1da3ebd281d97b3ba58de34d6b452d94820e2888de652b8948562' 
  AND token = 'uTlgXtVAXg+ExBeM3b6hxF4XjGV3Fpi1ZH1Wh60AXQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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