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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f96a0ca32b0f2699a9083742db3bf42f28463e49354b8cbefb3c69b2f7caebc' 
  AND token = 'O2n8FK/jfrmKC4t4594PEkqHC6ojKSmT9nOZ57HG9oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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