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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1704ba35d6109f554b20eecb5ed888c5f5a51101ac777d93e1d18578acf35d3a' 
  AND token = 'okZ1YL8cv+ILjz+bYvU5I4JqU68+rXFftEawZ+vss4s=' 
  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"
    }
  }
}