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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fef92e80dc10f748d1c2f33ddbd9b54cb03a192be2727944289fdbf650cd112' 
  AND token = 'hFSw1WVN7neHupurc8NF5xtDTvhESwo4yoZAPUsxrPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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