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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7775a9a1457d9e6de6e026289c004b865c8b4bd383ba19ec85076cd8678eb7fe' 
  AND token = 'vmGVxgk7Esx0XxBfDB9byAfCZ9S3r0AnxLmE74qTWGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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