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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b1b88681bd2a5a5f1e152a5976fdd1fcb38c0b95ae1ceb497f65bda99014a5' 
  AND token = 'iNhmTsB3Yv1ow2xuPRH6Ht1sNkb/3x8LoP1+wcGxzV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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