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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d9afb04d3f46ab223b615474958925c2acd26bbfb3f2cf1620f19c11fed95c' 
  AND token = 'bt3DLplL/8oPWmBp7OokSRBckv+TzHjy6dOl5cfJLvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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