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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e892cdc851f292885a6b8e47db7c2f3cd3244d10bf2f366a4f369a0e56ab673d' 
  AND token = 'gtESkxtxm9G4zf0wT4z07er3MeUffnDB458atRe/PeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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