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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a80fdc3ef381369a0d4c82b32a48db356fa7ed6ae9c75891f7d20a3f5e54974' 
  AND token = 'MpOOKauJ2aO0rAJY5yBPb34/HYdBgG51Q1NVIa7hGrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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