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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34d016177a7e9d3b1a378804170009c1e990ca399ebf05366630a96150db821' 
  AND token = 'pK/FqhibG+Hg5C5oyM+356PYVHX4oWcKLgeEiOE7w4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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