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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7525d84636658136cf4fc1f5e5d1eeac9de67ea57c4c2661aea73c0708954ee' 
  AND token = 'rB5G9oBtULBfdnMFPElnnjt5MuKlMsA2tgr3WMFPvzo=' 
  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"
    }
  }
}