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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95deb1919b48d3b834b0de4cf45341a972bfc2a37f0188ecabc8f2e2f5715c86' 
  AND token = 'gapAS86AqBZyqqy1wauRF49I80rocgpyvCxdSLU+nmM=' 
  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"
    }
  }
}