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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffc82f2a1ee7c326fa3a713b530ae77e12ccf91a073fe3fc2c5023d1a802cd8' 
  AND token = 'A3BOqhlHBEx9ZLC9LCus0Gc57F8TSEPVYWLNS4rBQ6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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