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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8953e92a528d6dba4e7b6df5be3443f7724a1374e50a975cf4c03f389fe3e58' 
  AND token = '2was531yBo0a5kEgLyP4W6+A1hHPqFFryw6A5XSw76k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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