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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140e170a91e007066070217c1e3f6067dac3aea1032127473fb9e82baf92d654' 
  AND token = 'nKgHCzU76fQgPPXXc8v7fkIQruXoS+uQmPgGxlZls6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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