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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43c1b45183449163d8054f98e3580bd14530275d8034df0e4bc8c7687253de4' 
  AND token = 'Ikef3t9pHWvQOblUw15yr0i2oF98lGWFeyBxbKapNZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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