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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16169d15a1e2f9c5fa3f4674dafffa032b277d1abe9cbbc046d41e640cf1e695' 
  AND token = 'WTAZEJN/lrX3OwDDiogg/a1rgPSug1FwpgjuQsXTeQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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