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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb59866358a544a0292ca47a581c4a33f0e47d21480b358f4a48b0eace881177' 
  AND token = 'Juz9wTkXsZxg1DacV+kJv+K9wmufgoTDaDI47hdVNLE=' 
  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"
    }
  }
}