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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c84a21e580c978afce9d9f4dcf2fc4880805667fab0a7ab64ce5282214dae1' 
  AND token = 'uClpe5XHcXp67yWIX/x+OFgn8p300kRn2i1qEDCF+a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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