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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8a151e15ec70fce000a740bb32470032e05d9064a823fe5d5fff516e02dc9e' 
  AND token = '3mYJ2651lQieDBN7P9qxo//1/xDf1yOmjKYg2k6P3kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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