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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39ca99819057af3b32f5666a00b0f2ac3ace00365ba061e964ed4cb001818a9' 
  AND token = '8Fi42qI92Ra/mnUBgnE3obSki4SFIhNyr9jOerpeX18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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