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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ee1ff01f4e8a98da3310b561f2cfc91031c4b5c03ea6655a3a49c99aeddb97' 
  AND token = '6d4HZeyiw4mPKZ7O9tT2QhvOIGPShmf6uo2JTTjtpKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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