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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcb6fc95b844de92d87e20dc2fcf8e116a90a116ed834e6893aea7d6c728b64' 
  AND token = 'wCSYHYexJ65kJrGRM7A4J2lXmkfH1Bozw66gZP4qMnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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