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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17af0bd18a845da94bc1935fb2701bc15aa3bb8a8c9f7ce003f298137a489fb' 
  AND token = 'o2eMwSOYRDzMQ6ZcmBPtS6a3BsyxLPkMp6NkOeIAQE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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