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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111467bac54b4ef6fc9b671d94115f8a29251abb3ae73ff13264a8f9060ea061' 
  AND token = 'C08niz6UAx1uy5MtU369xvGEybCG7c3Lb8+b3HE20Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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