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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8697400953edb8af875b035ea9aa33cb65f81bd8e55d08abf6f3c2390352ee6a' 
  AND token = 'JVOUM3V+N7k05mBlIU4N2sxa6QNCihIplA38SLYYGbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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